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Related Concept Videos

Imaging Studies IV: Magnetic Resonance Imaging01:27

Imaging Studies IV: Magnetic Resonance Imaging

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Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...
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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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A Cognitive Fusion-guided Prostate Biopsy Using Multiparametric Magnetic Resonance Imaging and Transrectal Ultrasound
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Prostate lesions characterization using diffusion-weighted spatiotemporal encoded MRI: Feasibility and initial

Martins Otikovs1, Orith Portnoy2,3, Debbie Anaby2,3

  • 1Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel.

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Summary

Spatiotemporally encoding (SPEN) diffusion-weighted imaging (DWI) shows promise for prostate cancer lesion detection, offering comparable results to echo-planar imaging (EPI) in most cases and reduced distortions.

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ADC mappingLLR reconstructionPI-RADS criteriaSPENdiffusion-weighted imagingprostate cancer

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Area of Science:

  • Medical Imaging
  • Radiology
  • Biophysics

Background:

  • Diffusion-weighted imaging (DWI) is crucial for prostate cancer detection.
  • Echo-planar imaging (EPI) is the standard DWI technique but is prone to distortions.
  • Spatiotemporally encoding (SPEN) offers an alternative DWI approach.

Purpose of the Study:

  • To evaluate the feasibility and reliability of a SPEN-based DWI protocol for prostate lesions.
  • To compare SPEN-DWI with conventional EPI-DWI in a clinical setting.

Main Methods:

  • A SPEN-based DWI protocol was developed adhering to Prostate Imaging-Reporting and Data System guidelines.
  • The protocol incorporated a novel local, low-rank regularization algorithm.
  • Eleven patients with suspected prostate cancer underwent both SPEN-DWI and EPI-DWI at 3 T.

Main Results:

  • SPEN-DWI and EPI-DWI yielded comparable diagnostic information in 7 out of 11 patients.
  • SPEN-DWI demonstrated reduced susceptibility to field-derived distortions in 3 cases.
  • EPI-DWI was superior in one case due to SPEN's limitations with shorter effective repetition times (TR).

Conclusions:

  • SPEN-DWI shows potential for prostate lesion visualization, particularly at higher b-values (≥900 s/mm²).
  • SPEN-DWI can mitigate distortions near the rectum caused by magnetic field inhomogeneities.
  • SPEN-DWI's performance can be affected by short effective TRs, introducing T1-weighting.